POST

The tidyquant package provides tools and data for visualizing and analysing equities. Here is an example using data from POST.

dat <- tq_get(toString(params$ticker))
dat %>% ggplot(aes(x = date, y = close)) +
    geom_barchart(aes(open = open, high = high, low = low, close = close)) +
    labs(title = paste(params$ticker,"Bar Chart"), y = "Closing Price", x = "") +
    theme_tq()

Or functions of the data, like returns.

dat.new <- dat %>% tq_transmute(select= adjusted,
                 mutate_fun = periodReturn,
                 period     = "daily",
                 col_rename = "Ra") %>% as_tsibble(index=date) 
dat.new %>% autoplot()

Adding Some Interactives

The following are a few quick interactive plots.

library(tidyquant)
library(tidyverse)
library(magrittr)
# Use tidyquant to get the data
# Slice off the most recent 120 days
dat.tail <- tail(dat, 120)
dat.tail %<>% mutate(
    open = round(open, digits=2),
    close = round(close, digits=2),
    high = round(high, digits=2),
    low = round(low, digits=2),
    adjusted = round(adjusted, digits=2)
    )

Let’s have a look at the data.

library(DT)
datatable(dat.tail)

The Plot

There are a few charts specifically designed for OHLC data that are included in plotly. Here I want to deploy a basic one with one modification. I want daily increases in black and daily decreases in red.

library(plotly)
# basic example of ohlc charts
# custom colors
i <- list(line = list(color = '#000000')) # black
d <- list(line = list(color = '#FF0000')) # red
# Create the figure
fig.2 <- dat.tail %>%
  plot_ly(x = ~date, type="ohlc",
          open = ~open, close = ~close,
          high = ~high, low = ~low,
          increasing = i, decreasing = d)
fig.2

ggplot candlestick

dat %>%
    ggplot(aes(x = date, y = close)) +
    geom_candlestick(aes(open = open, high = high, low = low, close = close)) +
    labs(title = paste0(params$ticker," Candlestick Chart", sep=""), y = "Closing Price", x = "") +
    theme_tq()

Another Plot

dat %>%
    ggplot(aes(x = date, y = close)) +
    geom_barchart(aes(open = open, high = high, low = low, close = close)) +
    geom_ma(ma_fun = EMA, n = 50, wilder = TRUE, linetype = 5, size = 1.25) +
    geom_ma(ma_fun = EMA, n = 200, wilder = TRUE, color = "red", size = 1.25) + 
    labs(title = paste0(dat$symbol," Bar Chart", sep=""), 
         subtitle = "50 and 200-Day EMA", 
         y = "Closing Price", x = "") + 
    coord_x_date() +
    theme_tq()

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